Machine Coding

Build a working component or service under time pressure.

Adobe
Implement a JSON config loader with env overrides.
Full-stackNew Grad / JuniorEasy◆ Commonly asked
#config
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Adobe
Build a "polling" progress UI that updates from an API.
Full-stackNew Grad / JuniorMedium◆ Commonly asked
#react#async
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Adobe
Build an in-memory rate limiter as a middleware.
BackendSeniorMedium◆ Commonly asked
#rate-limit#middleware
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Adobe
Build a CSV importer that streams and validates rows.
BackendSeniorMedium◆ Commonly asked
#streaming#validation
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Adobe
Build a countdown timer with pause and resume.
FrontendMidEasy◆ Commonly asked
#react#state
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Adobe
Build a kanban board with drag and drop.
FrontendMidHard◆ Commonly asked
#react#dnd
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Adobe
Build an accessible tabs component with keyboard nav.
Full-stackMidMedium◆ Commonly asked
#react#a11y
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Adobe
Implement a job queue with retries and backoff.
Full-stackMidHard◆ Commonly asked
#queue#reliability
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Affirm
Build a color-picker with hex/rgb sync.
FrontendMidMedium◆ Commonly asked
#react#ui
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Affirm
Build a stopwatch with lap times.
FrontendMidEasy◆ Commonly asked
#react#state
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Affirm
Implement an LRU + TTL cache library.
Full-stackMidHard◆ Commonly asked
#cache#ttl
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Affirm
Build a carousel/image slider.
Full-stackMidMedium◆ Commonly asked
#react#ui
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Affirm
Implement a JSON config loader with env overrides.
BackendNew Grad / JuniorEasy◆ Commonly asked
#config
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Affirm
Build an in-memory pub/sub with topic subscriptions.
BackendNew Grad / JuniorMedium◆ Commonly asked
#pub-sub
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Airbnb
Implement a JSON config loader with env overrides.
BackendSeniorEasy◆ Commonly asked
#config
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Airbnb
Build a background job runner with priorities.
BackendSeniorMedium◆ Commonly asked
#queue#workers
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Airbnb
Build a "Wordle" clone with keyboard input.
FrontendMidMedium◆ Commonly asked
#react#state
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Airbnb
Build an accessible accordion with single/multi open.
FrontendMidMedium◆ Commonly asked
#react#a11y
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Airbnb
Build a REST endpoint with pagination, filtering and sorting.
Full-stackMidMedium◆ Commonly asked
#api#pagination
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Airbnb
Build a "connect four" game with win detection.
Full-stackMidMedium◆ Commonly asked
#react#state
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Airbnb
Build an in-memory pub/sub with topic subscriptions.
BackendNew Grad / JuniorMedium◆ Commonly asked
#pub-sub
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Airbnb
Build a webhook receiver with signature verification.
BackendNew Grad / JuniorMedium◆ Commonly asked
#security#api
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Airtable
Design and build a URL-shortener service (API + storage).
BackendSeniorMedium◆ Commonly asked
#api#hashing
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Airtable
Implement an idempotent "charge" endpoint.
BackendSeniorHard◆ Commonly asked
#idempotency#payments
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Airtable
Build an accessible tabs component with keyboard nav.
FrontendMidMedium◆ Commonly asked
#react#a11y
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Airtable
Build a modal/dialog with focus trapping.
FrontendMidMedium◆ Commonly asked
#react#a11y
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Airtable
Build a form builder that renders from a JSON schema.
Full-stackMidHard◆ Commonly asked
#react#forms
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Airtable
Build a star-rating component (controlled + accessible).
Full-stackMidEasy◆ Commonly asked
#react#a11y
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Airtable
Implement cursor-based pagination over a sorted dataset.
BackendNew Grad / JuniorMedium◆ Commonly asked
#pagination#api
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Airtable
Implement a job queue with retries and backoff.
BackendNew Grad / JuniorHard◆ Commonly asked
#queue#reliability
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Amazon
Build a URL health checker with a concurrency limit.
BackendNew Grad / JuniorMedium◆ Commonly asked
#concurrency
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Amazon
Implement an exponential-backoff HTTP client.
BackendNew Grad / JuniorMedium◆ Commonly asked
#reliability
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Amazon
Build a nested checkbox tree with indeterminate state.
FrontendNew Grad / JuniorHard◆ Commonly asked
#react#recursion
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Amazon
Build a "Wordle" clone with keyboard input.
FrontendNew Grad / JuniorMedium◆ Commonly asked
#react#state
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Amazon
Implement a job queue with retries and backoff.
BackendMidHard◆ Commonly asked
#queue#reliability
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Amazon
Implement cursor-based pagination over a sorted dataset.
BackendMidMedium◆ Commonly asked
#pagination#api
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Anthropic
Build a nested, collapsible comment thread.
FrontendNew Grad / JuniorMedium◆ Commonly asked
#react#recursion
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Anthropic
Build a "polling" progress UI that updates from an API.
FrontendNew Grad / JuniorMedium◆ Commonly asked
#react#async
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Anthropic
Implement an idempotent "charge" endpoint.
BackendMidHard◆ Commonly asked
#idempotency#payments
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Anthropic
Implement a bulk-upsert endpoint with validation.
BackendMidMedium◆ Commonly asked
#api#validation
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Anthropic
Implement a JSON config loader with env overrides.
Full-stackSeniorEasy◆ Commonly asked
#config
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Anthropic
Build a countdown timer with pause and resume.
Full-stackSeniorEasy◆ Commonly asked
#react#state
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Anthropic
Build an accessible accordion with single/multi open.
FrontendSeniorMedium◆ Commonly asked
#react#a11y
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Anthropic
Build a toast / notification queue.
FrontendSeniorMedium◆ Commonly asked
#react#state
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Apple
Build a kanban board with drag and drop.
Full-stackMidHard◆ Commonly asked
#react#dnd
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Apple
Build an in-memory rate limiter as a middleware.
Full-stackMidMedium◆ Commonly asked
#rate-limit#middleware
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Apple
Implement a job queue with retries and backoff.
BackendNew Grad / JuniorHard◆ Commonly asked
#queue#reliability
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Apple
Implement a bulk-upsert endpoint with validation.
BackendNew Grad / JuniorMedium◆ Commonly asked
#api#validation
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Apple
Build a color-picker with hex/rgb sync.
FrontendNew Grad / JuniorMedium◆ Commonly asked
#react#ui
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Apple
Build a carousel/image slider.
FrontendNew Grad / JuniorMedium◆ Commonly asked
#react#ui
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Asana
Build a "polling" progress UI that updates from an API.
Full-stackNew Grad / JuniorMedium◆ Commonly asked
#react#async
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Asana
Build an image carousel with autoplay and swipe.
Full-stackNew Grad / JuniorMedium◆ Commonly asked
#react#ui
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Asana
Build a file-upload service with chunking and resume.
BackendSeniorHard◆ Commonly asked
#streaming#storage
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Asana
Build a mini ORM query builder (select/where/join).
BackendSeniorHard◆ Commonly asked
#parsing#sql
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Asana
Build a kanban board with drag and drop.
FrontendMidHard◆ Commonly asked
#react#dnd
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Asana
Build a color-picker with hex/rgb sync.
FrontendMidMedium◆ Commonly asked
#react#ui
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Asana
Implement a JSON config loader with env overrides.
Full-stackMidEasy◆ Commonly asked
#config
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Asana
Build a tic-tac-toe game with win detection.
Full-stackMidEasy◆ Commonly asked
#react#state
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Atlassian
Build an in-memory pub/sub with topic subscriptions.
Full-stackSeniorMedium◆ Commonly asked
#pub-sub
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Atlassian
Build auth middleware that verifies a JWT.
Full-stackSeniorMedium◆ Commonly asked
#auth#security
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